Question

我有以下JSON：

{
0: 200,
error: false,
campaigns: {
current_campaigns: [
                {
                id: "1150",
                campaign_type_id: "1",
                campaign_type: "Type",
                title: "Name (with type) ",
                url: "http://www.example.com",
                special: null,
                campaign_instructions: "Here's what you do",
                pay_description: "",
                start: "2013-10-14 00:00:00",
                end: "2014-03-31 23:59:59"
                },
                {
                id: "1151",
                campaign_type_id: "1",
                campaign_type: "Type",
                title: "Name (with type) ",
                url: "http://www.example.com",
                special: null,
                campaign_instructions: "Here's what you do",
                pay_description: "",
                start: "2013-10-14 00:00:00",
                end: "2014-03-31 23:59:59"
                },
    ],
    new_campaigns: [
                {
                id: "1152",
                campaign_type_id: "1",
                campaign_type: "Type",
                title: "Name (with type) ",
                url: "http://www.example.com",
                special: null,
                campaign_instructions: "Here's what you do",
                pay_description: "",
                start: "2013-10-14 00:00:00",
                end: "2014-03-31 23:59:59"
                }

    ]
}

以下代码

NSURL *theJSON = [NSURL URLWithString:@"http://somejsonurl"];
NSURLRequest *request = [NSURLRequest requestWithURL:theJSON];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError){
    NSError *errorJson = nil;
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:data options:0     error:&errorJson];

    NSArray *campaigns = dataDictionary[@"campaigns"];

    for (NSDictionary *campaignList in campaigns) {
        NSLog(@"Call gave: %@", campaigns);
    }

我最终会如何记录current_campaign标题？我试过了

   NSLog(@"%@", [campaignList objectForKey:@"title"]);
   NSLog(@"%@", campaigns[@"title"] );

并没有成功。我在Objective C上相当新，并且无法理解你如何使用NSArray和NSDictionary挖掘JSON。任何帮助将不胜感激！

Answer 1

关于JSON最容易记住的是每次看到括号＆＃34; [＆＃34;，这意味着Array和＆＃34;]的开头＃34;结束了。每当你看到一个大括号＆＃34; {＆＃34;这意味着Dictionary和＆＃34;}＆＃34;的开头结束了。

因此，在您的示例中，campaigns是Dictionary元素，其他Dictionary（current_campaigns）包含Array Dictionaries。这些Dictionaries中的每一个都有一个名为key的{{1}}。

所以长版本（未经测试）：

title

如何使用NSDictionary收集嵌套在数组中的JSON数据

1 个答案: